Bump and IO strategies trade SI/PI margin against routability.
+------------------+----------------+----------------+----------------+
| Approach | Strength | Weakness | Best when |
+------------------+----------------+----------------+----------------+
| Strict | predictable | slower early | new program |
| Balanced | practical | needs rigor | stable teams |
| Aggressive | fast | escape risk | late schedule |
| Re-architect | durable | expensive | recurring failures |
+------------------+----------------+----------------+----------------+Pick the approach based on residual silicon risk, not only schedule pressure.
Policy-only arguments without artifact evidence
Unbounded waivers
INTEGRATION EVIDENCE MATRIX — Bump Map & Escape Planning
+-------------------+------------------------+--------------------------+-------------------------+
| Evidence | Tells you | Does not prove | Next action |
+-------------------+------------------------+--------------------------+-------------------------+
| Manifest diff | baseline changed | root cause itself | isolate first delta |
| Domain trace | where behavior diverged| ownership accountability | map to contract owner |
| Signoff dashboard | closure posture | reproducibility quality | verify source artifacts |
| Bring-up logs | software-visible symptom| physical/timing cause | correlate with HW trace |
| Waiver register | accepted residual risk | technical closure | review expiry criteria |
+-------------------+------------------------+--------------------------+-------------------------+Package assumptions must be treated as first-class chip constraints.
PACKAGE CO-DESIGN
die io <-> package routing <-> board constraintsPACKAGE RISK MIX
SI margin █████
power integrity ████
lane mapping ███bump map revision log
SI/PI margin report
IO co-design checklist
package bring-up failures
Link degradation on product board came from package routing assumptions not reflected in pre-silicon model.
Compare package model versions
Audit lane mapping
Correlate SI/PI margins to failures
Ask: what baseline, owner, and artifact prove this topic is truly closed?
State baseline manifest and owner with every closure metric.
Run cross-domain regression after every top-level fix.
Comparing results across different manifests.
Unowned issues slipping through review cycles.
Waiving risks without expiry and validation plan.
Bump maps and escape strategy determine routability, IR quality, and package feasibility before final pad-ring freeze.
Metric: bump congestion, reroute churn, escape DRC violations
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